Study population: From the "Health2010" study, that was initiated February 2010 at the RCPH, 150 sedentary participants will be consecutively invited and randomised by computer-generated random numbers into A) an intervention group (n=75) and B) a control group (n=75), when visiting the RCPH for the health examination. The entire Health2010 population will comprise 4.000 men and women between 19 and 69 years of age.